Decibel Calculator

Convert between sound intensity ratios and decibels, and calculate how dB level drops with distance from a point source using the inverse square law.

Intensity Ratio ↔ dB

Sound Level (dB SPL)

Intensity Ratio (I/I₀)

      0 dB306090120140+
    

Level at d₁ (dB)

Distance d₁ (m)

Distance d₂ (m)

Threshold of hearing0 dB

Whisper30 dB

Normal conversation60 dB

City traffic85 dB

Rock concert110 dB

Jet engine (close)140 dB